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UNDP-EPA Webinar Key Elements of a National GHG Inventory System April 10, 2013

The Key Category Analysis. Mausami Desai Climate Change Division U.S . Environmental Protection Agency. UNDP-EPA Webinar Key Elements of a National GHG Inventory System April 10, 2013. Why Do a Key Category Analysis?. Conduct Key Category Analysis

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UNDP-EPA Webinar Key Elements of a National GHG Inventory System April 10, 2013

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  1. The Key Category Analysis Mausami Desai Climate Change Division U.S. Environmental Protection Agency UNDP-EPA Webinar Key Elements of a National GHG Inventory System April 10, 2013

  2. Why Do a Key Category Analysis? Conduct Key Category Analysis IPCC Good Practice (Chapter 7); IPCC 2006 GL (Vol. 1, Ch. 4) Identifies key categories and informs priorities for National GHG Inventory preparation and improvement • Focus resources on Key Categories • Inform methodological choice, e.g. choose more advanced methods (Tier 2, 3) • Obtaining better activity data, developing country-specific EF • Focus QA/QC, strengthen institutional arrangements, etc.

  3. Approaches for Conducting a Key Category Analysis IPCC defines a key category as: “a category that is prioritized within the national inventory system because its estimate has a significant influence on a country’s total inventory of greenhouse gases in terms of the absolute level, the trend, or the uncertainty in emissions and removals. Whenever the term key category is used, it includes both source (“emission”) and sink (“removal”) categories.” National Emissions • Quantitative Approaches • Qualitative Criteria Key Categories

  4. Identifying Appropriate Approach for Key Category Analysis

  5. Quantitative Approaches for Conducting a Key Category Analysis • Level Assessment • Identify categories that contribute at least 95% of national emissions in the current GHG inventory • Tier 1–sources/sinks are sorted and ranked according to their contribution to total emissions • Tier 2 – same as Tier 1 but accounts for uncertainty

  6. Quantitative Approaches for Conducting a Key Category Analysis Understanding the Mechanics of the Key Category Analysis Step 1) List all Inventory categories Emission Category-CO2 X Tonnes Emission Category-CO2 Y Tonnes Emission Category-CH4 Z Tonnes Removal Category-CO2 A Tonnes Emission Category-N2O B Tonnes ….Emission Category…

  7. Quantitative Approaches for Conducting a Key Category Analysis Step 2) Sort in descending order by contribution to total (absolute) Emission Category-CO2YTonnes 40% Emission Category-N2O BTonnes 25% Emission Category-CH4ZTonnes 15% Emission Category-CO2XTonnes 15% Removal Category-CO2ATonnes 4% ….Emission Category…

  8. Quantitative Approaches for Conducting a Key Category Analysis Step 3) Sum cumulative contribution of sources/ sinks (absolute in descending order) until you reach 95% Emission Category-CO2YTonnes 40% Emission Category-N2O BTonnes 25% Emission Category-CH4ZTonnes 15% Emission Category-CO2XTonnes 15% Removal Category-CO2ATonnes 4% …Emission Category… Key Categories Sum 95%

  9. Quantitative Approaches for Conducting a Key Category Analysis • II. Trend Assessment • Identify categories that have trend that is significantly different from the trend of the overall inventory, these categories may not be large enough to be identified by the level assessment. • Tier 1– sources and sinks are sorted and ranked according to contribution to the inventory trend • Tier 2 – same as Tier 1, but accounts for uncertainty.

  10. Qualitative Approach to Conducting Key Category Analysis Qualitative Criteria include indentifying categories where: • Mitigation techniques and technologies applied • Expected emission growth • Uncertainties not yet quantified, but presumed high • Not yet included in inventory (completeness) • Other criteria • UNFCCC CGE training materials • UNDP Managing the GHG Inventory Process

  11. Other General Consideration for Conducting Key Category Analysis With appropriate disaggregation, the KCA can highlight important source and sink subcategories: • Use subcategory disaggregation suggested by IPCC • IPCC Good Practice Guidance, Ch. 7, Table 7.1 • IPCC 2006 Vol. 1, Ch. 4 Table 4.1 • Evaluate GHGs from a single category separately • CO2 from Road Transportation • CH4 from Road Transportation • N2O from Road Transportation • Important to include sub-categories for larger emissions sources: • Ag/LULUCF • Land converted to Cropland • Land Converted to Grassland • Etc. • Fossil Fuel Combustion (FFC) in the Energy Sector • Splitting Stationary FFC into Energy vs. Manufacturing vs. Residential • Disaggregate further by fuel types • Splitting Transport into Road Transport vs. Aviation vs. Water-borne

  12. Tools: Template Workbook and ALU Key Category Analysis National System Templates Template 5 is the Key Category Analysis Key Category Tool Helps calculate Key Categories for you using Microsoft Excel or OpenOffice Calc

  13. Where to Obtain the Key Category Analysis Tool Download Link http://www.epa.gov/climatechange/EPAactivities/internationalpartnerships/capacity-building.html

  14. Background on the Key Category Analysis Tool • Consistent with 2006 GL • Improves and corrects for errors in IPCC Good Practice Guidance Ch. 7 • Capable of all Quantitative Approaches • Tier 1 Level and Trend Analysis • Tier 2 Level and Trend Analysis • Generates summary table to insert in KCA template

  15. Preparing to Conduct Key Category Analysis Recommended materials: • Review this presentation • Review IPCC GL as appropriate: • IPCC Good Practice Guidance Ch. 7 – Methodological Choice and Recalculation • IPCC 2006, Vol. 1, Chapter 4 – Methodological Choice and Identification of Key Categories • Review EPA documentation template • Collate Inventory summary table consistent with categorization recommended by the IPCC GL

  16. Preparing to Conduct Key Category Analysis: Sample Inventory

  17. Filling in the Key Categories Table

  18. Key Category Analysis How this Tool and Template Will Help! In this tool and template: • Identify all key categories of GHG emissions • Rank emissions sources • Describe and document how you completed the key category analysis (KCA) Help the inventory team: • Conduct a KCA • Perform an optional uncertainty analysis • Identify the most important GHG categories • Communicate key categories to the UN • Identify areas for improving estimates

  19. Mausami Desai Desai.mausami@epa.gov +202.343.9381 Thanks For Your Attention! U.S. EPA Inventory Preparation Tools www.epa.gov/climatechange/EPAactivities/internationalpartnerships/capacity-building.html

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